Benisumomo serves as an upperclassman leader of her group within the Akane Class, occasionally known as the "Unassigned Group." She stands 157 cm tall, visually marked by pink hair and a distinctive triangular hair clip. Benisumomo cultivates a deliberately lazy image, frequently observed napping in a hammock to project effortless talent and self-proclaimed genius status.

This relaxed facade conceals a core contradiction. Privately, Benisumomo undertakes intense, secret training sessions, driven by a belief that being seen as a hard worker is "uncool." Only her close friend and rival Tsubaki, alongside their teacher Hana, know of this hidden diligence. Her mastery encompasses nearly all ninja arts, placing her skill level equal to Tsubaki, the Akane Class's top student. However, occasional overconfidence leads her to challenge formidable opponents like Hana, who swiftly defeats her and advises more training.

Benisumomo demonstrates a protective instinct towards teammates and friends, evidenced by interventions supporting individuals like Housenka and Tsuwabuki. Yet, her attempts at encouragement sometimes result in unintentionally hurtful remarks, as with Hinagiku, leaving her remorseful. She generally prefers solitary training and avoids overly talkative people.

Leading the Sheep Team alongside Touwata and Mizubashou, Benisumomo relies on Mizubashou to help manage team dynamics and soften her occasionally abrasive nature. Her rivalry with Tsubaki remains a constant, marked by mutual respect and competition; a notable combat training duel between them concluded in a stalemate. Like her peers, she reacts with fear to Hana's stern authority.

Her birthday falls on March 3, aligning with the Pisces zodiac sign. Benisumomo consistently dislikes nagging, excessively chatty people, and maintains her preference for training alone.